package socket;

import com.sun.xml.internal.ws.api.ha.StickyFeature;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;


public class Server5 {
    private ServerSocket serverSocket;

    //该集合用于保存所有的客户端的输出流，用于广播消息
    private List<PrintWriter> allOut = new ArrayList<>();

    public Server5() {
        try {
            System.out.println("正在启动服务器");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {

        try {
            while (true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接上了");
                //启动一个线程负责与客户端交互
                Runnable handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server5 server = new Server5();
        server.start();
    }

    /*
    该线程负责与指定的客户端进行交互
     */
    private class ClientHandler implements Runnable {
        private String host;//记录客户端的IP地址
        private Socket socket;

        public ClientHandler(Socket socket) {
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        @Override
        public void run() {
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw, true);

                //将客户端的输出流存入到共享集合中
                synchronized (allOut) {
                    allOut.add(pw);
                }
                sendMessage(host + "上线了，当前在线人数" + allOut.size());

                String message;
                while ((message = br.readLine()) != null) {
                    sendMessage(host + "说：" + message);
                }
            } catch (IOException e) {
//                e.printStackTrace();
            } finally {
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                sendMessage(host + "下线了，当前在线人数" + allOut.size());

                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        private void sendMessage(String message) {
            System.out.println(message);
            synchronized (allOut) {
                for (PrintWriter o : allOut) {
                    o.println(message);
                }
            }
        }

    }
}
